Evolution and Animal Life: An Elementary Discussion of Facts, Processes, Laws and Theories Relating to the Life and Evolution of AnimalsD. Appleton, 1907 - Всего страниц: 489 |
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Стр. 254
... centrosome and the cytoplasm im- mediately surrounding it . We have already indicated the presence of the centrosome as a minute spherical structure lying at one side of the nucleus . This body assumes an ellipsoidal form , constricts ...
... centrosome and the cytoplasm im- mediately surrounding it . We have already indicated the presence of the centrosome as a minute spherical structure lying at one side of the nucleus . This body assumes an ellipsoidal form , constricts ...
Стр. 255
... centrosome partly developed ; B , skein stage , chromatin visible as a convoluted band , the centrosomes having separated ; C , the nuclear membrane having disappeared , and a few of the chromosomes lying free in the cytoplasm ; D ...
... centrosome partly developed ; B , skein stage , chromatin visible as a convoluted band , the centrosomes having separated ; C , the nuclear membrane having disappeared , and a few of the chromosomes lying free in the cytoplasm ; D ...
Стр. 256
... centro- some , though this and many other points regarding the forces at work must be left for future investigation to decide ... centrosome and a nucleus , similar in all respects to the parent cell from which it has arisen . " A simple ...
... centro- some , though this and many other points regarding the forces at work must be left for future investigation to decide ... centrosome and a nucleus , similar in all respects to the parent cell from which it has arisen . " A simple ...
Стр. 267
... centrosome of the sperm ( B ) . The sperm nucleus swells up and rapidly increases in size , its chromatin changing from the compact condition in which it is arranged in the sperm head to a reticulate condition ( C ) . The chromatin re ...
... centrosome of the sperm ( B ) . The sperm nucleus swells up and rapidly increases in size , its chromatin changing from the compact condition in which it is arranged in the sperm head to a reticulate condition ( C ) . The chromatin re ...
Стр. 268
... centrosome and attraction sphere . C , Egg nucleus on the left , sperm nucleus on the right of the center of egg ; aster fibrils preceding the fission of the centrosome . D , The centrosome has divided , the two attraction spheres ...
... centrosome and attraction sphere . C , Egg nucleus on the left , sperm nucleus on the right of the center of egg ; aster fibrils preceding the fission of the centrosome . D , The centrosome has divided , the two attraction spheres ...
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actual adaptation adult animals animals and plants ants apes appear artificial selection bees beetles biological biologists birds body breeding butterfly called causes centrosome changes CHAPTER characters chromatin chromosomes color and pattern common crab Darwin degeneration degree descent differentiation division egg cell embryo environment existence fact factors fauna female fertilized fishes forms fossils gastrula genus germ cells habit hatched heredity host hybrid individuals influence inheritance insects instinct islands isolation kinds of animals known larva larvæ live lower male mammals matter ment modified mutations natural selection naturalists nest nucleus offspring organic evolution origin Origin of Species parasites parent phenomena plasm primitive produced protoplasm Protozoa race relation reproduction resemblance Sacculina sea anemone sexual sexual selection sheep simple species species-forming sperm spines stage structure substance tail theory tion traits tree variation various vertebrates Weismann wings workers worm young